#include<stdio.h>
int main()
{
    float x,y;
    printf("enter x\n");
    scanf("%f",&x);
    if(x<1){
        y=x;
    }else
    if(x>=1&&x<10){
        y=2*x-1;
    }else{
        if(x>=10){
            y=3*x-11;
        }
    }
    printf("y is %3.1f",y);
}